Dental engine



(No Model.) 2 Sheets-Sheet l.

J. 0. SCOTT.

DENTAL ENGINE.

No. 334,985. vPatente Jan. 26,1886.

' f n l I v (No Model.) 2 Sheets-Sheet 2. 1J. 0. SCOTT.

DENTAL ENGINE.

No. 334,985. Patented Jan. 26, 1886.

*M munnmum Ill-lll HIIIIIIIIIIIIIIIIIII I//ll/llll/ l /ll ma ess es f UNITED STATES i, y. PATENT Frisia.

JOHN O. SCOTT, OF WAUPACA, ASSIGNOR OF TWO-THIRDS TO MYRON F. PATTERSON AND JOHN Gr. PATTERSON, OF MILWAUKEE, WISCONSIN.

DENTAL SPECIFICATION forming part of Letters Patent No. 334,985, dated January 26, 1886.

Application filed November 9, 1885. Serial No. 182,232.

To all whom it may concern;

Be itknown that I, JOHN O. SCOTT, of Wan-- paca, in the county of Waupaca, and in the State of Wisconsin, have invented certain new and useful Improvements in Dental Engines; and I do hereby declare that the following is a full, clear, and exact description thereof.

My invention relates 'to dental engines, and will be fully described hereinafter'.

In the drawings, Figure l is a'perspective View of my engine complete. Fig. 2 is an elevation, partly in section, of the upper portion of the saine. Fig. 3is a similar view of the lower portion immediately in continuation of Fig. 2. Fig. Liis a detail of that portion shown in Fig. 3 in a position at right angles to its position in said gure. Fig. 5 is a central vertical section of the upper portion of Fig. 2. Fig. 6 is a horizontal section on the line :c x of Fig. 5. Figs. 7 and 8 are details.

A is the stand of my engine, which may be provided Wit-h a supporting-base of any desired style. In the top of the stand is` fixed a bushing, a, which forms a step-fercoii'e'end of a shaft, B, the upper end of which extends up into asleeve,0,where it is centered by abridge, b. This sleeve is seated in or on the upper end of a frame, C', the sides of which project up from the stand A. The shaft B has a collar or enlargement, b', and aspring, B', is coniined about the shaft B, between the collar b and a bridge, c, of the frame C', through which bridge the shaft B passes, the upper end of the spring being secured to shaft B, While the lower end is secured to the bridge c. The spring,therefore,has a torsional action,andits office is to return the shaft B and Wind the propellingcord after each action of the treadle. Near its upper end the frame C carries a pulley-bracket, C, which forms the bearings for the journals of pulleys O3. The sheaves of the pulleys are arranged diagonally to each other, so that While both ends ofthe cords D are un` wound about the shaft in one direction they will draw from opposite sides of the shaft Without interfering. The cord D is passed through the shaft B or otherwisesecured to it above the pulley-bracket C2, and its ends hang down over the pulleys to the arms e of the treadle E, and the shaft is propelled by de- (No model.)

pressing the treadle and unwinding thelcord, the cord being unwound at each depression 0i the lever and wound by the torsional action of 'the spring B to lift the treadle and prepare for another impulse. The upper end of shaft Bis slotted, as at d, to take the pin cl of a coupling, d, by which another shaft, F, is coupled to it, the connection being inade by siinply dropping shaft F into place. On its upper end shaft F has coupled to it the lower plate, G, of afriction-clutch,the hub g of which has ngers g',to take each a friction-roller, H, which rollers stand upright therein beneath a top plate, j.

K is a cap that ts over the hub and rollers, and this cap carries the axle L of the driving pulley L. One end ofthe axle L extends down into the hub g and fits loosely therein, while the other end has its bearing in a cross^piece,M.

O4 is a sleeve that telescopes into sleeve C, and is sustained at a proper height therein by a pin, 'm.,that` rests in a notch in the upper rini of sleeve C, and on its upper end the sleeve C* is fitted with a fraine that vconsists of a skeleton or basket, M', that incloses the clutch mechanism, and a cross-bar, M2, that with cross-bar M ferais the frame of pulley L.

o c are blocks that separate the cross-bars M and M2. The block o is heldin place preferably by a single screw-bolt, p, while block o is held by two screws, p' p', and this lastnamed block fornis the support for the first joint, P, of the tool-arm. This arni does not differ materially from those on other dental engines, consisting merely of jointed arms and a hand-piece connected by pulleys and belts to the driving-pulley.

Just beneath the block o, or at any other convenient point on the cross-bar M2, is journaled a mandrel, R, that has a pulley, It', that projects up through a slotted enlargement, m2, of the cross-bar M in such a position that it will be thrown into contact with the under side of the ri in of the pulley L when the sleeve C* is slightly lifted and turned, so as to take the pin m out of its notch in sleeve O, as shown in dotted lines, Fig. 8, and when this is done the mandrel may be used for turning a wheel, S, or any other tool.

While I have shown a peculiar clutch for IOO communicatingthe motion from shaft l5 to the pulley L, I do not propose to confine myself to the one shown, but may use any style of clutch I may find desirable.

The operation ol' my device is as follows: When the treadlc is in the position shown in Fig. l, the cord l) is wound about thc shaft B, and any depression of the treadle will draw the cord oil" of the shaft B, andin doing so will turn this shalt, which, through its connections,

- will turn the plate G- ol the clutch and canse the inclined surfaces between lingers g to throw the rollers H out against the inner periphery of cap K, and thus give an impulse to the axle L, and then when the shaft B is turned back by the spring l5 the hub returns for giving another impulse to the cap, and thus the cap is given successive impulses in one direction,aud a very high rate of speed may be attained.

l Having now fully described my invention, what I claim as new, and desire to securel by Letters Patent, is-

1. The combination, with a trcadle. of' a cord leading from the shaft to the arms of thc treadle over suitable pulleys, and a torsionspring for causing the cord to wind about the shaft, substantially as set forth.

2. The combination ofthe shaft, cord,treadle, and spring With a clutch, driving-pulley, and 30 connections, as set forth.

3. The con'ibination, with the driving-shaft and driving-pulley, of a clutch consisting of a lower plate having fingered hubs, a cap fitting over the hub, and rollers confined between the sides of the cap and the hub, as set forth.

4. The combination, with the driving-pulley, its frame, and a mandrel and pulley carried by the frame, of the sleeves G and G4, and pin for supporting sleeve C4 upon sleeve O, substantially as and for the purpose set forth.

In testimony that I claim the foregoing I have hereunto set my hand at Milwaukee, in the county of Milwaukee and State of Wisconsin, .in thc presence of two witnesses.

JOHN O. SCOTT.

Vituesses:

S. S. S'roU'r, MAURICE F. FREIE. 

